90939731 has 8 divisors (see below), whose sum is σ = 92363040. Its totient is φ = 89526528.

The previous prime is 90939713. The next prime is 90939733. The reversal of 90939731 is 13793909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90939731 is a prime.

It is a super-2 number, since 2×90939731² = 16540069348704722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90939733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16730 + ... + 21488.

It is an arithmetic number, because the mean of its divisors is an integer number (11545380).

Almost surely, 2^90939731 is an apocalyptic number.

90939731 is a deficient number, since it is larger than the sum of its proper divisors (1423309).

90939731 is a wasteful number, since it uses less digits than its factorization.

90939731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5053.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 90939731 is about 9536.2325370138. The cubic root of 90939731 is about 449.6948235380.

The spelling of 90939731 in words is "ninety million, nine hundred thirty-nine thousand, seven hundred thirty-one".